change script so enemy car gets destroyed when collided with player car

public var explosionPrefab : Transform;

function OnCollisionEnter(collidedObject : Collision) {
if (collidedObject.gameObject.tag == "Finish") {
Destroy(collidedObject.gameObject);
}
}

my enemy car will be the target and if it gets hit 3-4 times by my player car, it'll die. how do i change the script so when it collisions with or is collided with PlayerCar its gets destroyed?